Effects of lowpass and highpass filtering on the intelligibility of speech based on temporal fine structure or envelope cues.
Hear Res
; 260(1-2): 89-95, 2010 Feb.
Article
em En
| MEDLINE
| ID: mdl-19963053
ABSTRACT
This study aimed to assess whether or not temporal envelope (E) and fine structure (TFS) cues in speech convey distinct phonetic information. Syllables uttered by a male and female speaker were (i) processed to retain either E or TFS within 16 frequency bands, (ii) lowpass or highpass filtered at different cut-off frequencies, and (iii) presented for identification to seven listeners. Psychometric functions were fitted using a sigmoid function, and used to determine crossover frequencies (cut-off frequencies at which lowpass and highpass filtering yielded equivalent performance), and gradients at each point of the psychometric functions (change in performance with respect to cut-off frequency). Crossover frequencies and gradients were not significantly different across speakers. Crossover frequencies were not significantly different between E and TFS speech ( approximately 1.5kHz). Gradients were significantly different between E and TFS speech in various filtering conditions. When stimuli were highpass filtered above 2.5kHz, performance was significantly above chance level and gradients were significantly different from 0 for E speech only. These findings suggest that E and TFS convey important but distinct phonetic cues between 1 and 2kHz. Unlike TFS, E conveys information up to 6kHz, consistent with the characteristics of neural phase locking to E and TFS.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Percepção da Altura Sonora
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Inteligibilidade da Fala
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Percepção da Fala
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Percepção do Tempo
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Detecção de Sinal Psicológico
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Sinais (Psicologia)
Tipo de estudo:
Prognostic_studies
Limite:
Adult
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Female
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Humans
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Male
Idioma:
En
Revista:
Hear Res
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
França